Apparatus for feeding pulverized fuel



June 20, 1933. H. HARDINGE APPARATUS FOR FEEDING PULVERIZED FUEL Filed Dec. 14, 1927 anmmtoz will be in a most rearward It is apparent that w en equally. Equal portions of the fluids are then delivered to the respective conduits and the fluids are commingled'. For obtaining a maximum delivery of fuel to the burner,"damper 17 will be in a most rearward position as viewed from above, and dam r 18 will be in a most forward posi tion. With this setting of the dampers, all the fuel-laden fluid will be diverted into conduit, 16 and -all of the fuel free fluid will be diverted-into conduit 14'. When the burners are not functioning, damper 17 will be in a most forward position, as viewed from above, and damper 18 fosition. In order to make the positions 0 dampers 17 and 18 complementary to each other, a lever 26 and rods 27, 28 having connections with the lever .and with damper 17,18, respectively, are provided, Fi 3.

dampers 17 and 18 are so positioned as to cause a lar e quantityof pulverized fuel to be carrie to the burners through conduit 16 it is necessary that the quantity of air necessaryto support combustion at the burners be greater than when a lesser quantity of fuel is being fed to the burners, and vice versa. In order to regulate the quantity of air required for combustion pur oses in accordance with the quantity of fue to be consumed, I provide means which will control through conjoint operation the quantity or air required for combustion purposes in accordance with the 1 positions, of dampers 17, and 18. In the present embodiment of my invention I control. the quantity of air by providing evolve in the form oi a large gear-wheel 2%) having openings 30' therein to he brought in registry with holes 31 the wall of the furnacefil, Fig. 2. Any type of valve demay utilised and gear-wheel 29 may be conveniently mounted upon conduit 1%.

Gear-wheel 29. is rotatable through the agency of a pinion 33, fast to shai't 34. Shaft 34 is geared to elicit 35 which is, in turn, gcered to shaft Shaft 37, 3, is provided with a worm 38 for actuating a worm-gear sector 33* carried by lever 25, Controi shaft 37 may be operated irorn shaft 36 through the medium of a chain and gear mechanism 40. The chatting and gearing just described is intended to be operable from" any convenient location and. a hand wheel 41 is provided for that purpose. With this shafting and gearing arrangement it is ap arent that any change in the position of ampere 17 and 18 will also bring BbOHt COIIOIHIBQfly, a change in the size of uncovered area of openings 31 at the furnace. f

In order to complete my trol of the unitary pulverizmg and fuel feedin system, I regulate the amount of coal de 'veredto the pulverizer. when fuel is being consumed at the burner automatic 0on For example,

15 it is necessary to replenish the fuel which is being withdrawn from the pulverizer. To accomplish this end, I connect the oscillator lock-valve 42 by means of an arm 43, linlr 44 and arm 45 to the counter-shaft 36. Lock-valve 42 is 0% the usual type utilized for controlling the feed of material from a hopper to a ulverizer.

When han -wheel 41 is operated for causing damper 17 to divert a greater amount of fuel into conduit 16, gear-wheel 29 will be rotated to uncover a greater portion ofthe openings 31 and lock valve 42 will be rocked to rmit a greater quantity of fuel to descen from hopper 46 into chute 11 and into pulverizing mill 10. Likewise, when the amount of fuel-laden fluid diverted into conduit 16 is reduced, the area of the uncovered portions of the openings 31 at the furnace will he reduced and the lock 3 valve 42 will permit a. lesser quantity of coal to enter the pulverizing mill 10. It is therefore apparent that the mechanism just described is such as to coordinate by conjoint and concomitant. control the proportions of pulverizedfuel passing to the furuses, the quantity of air necessary to support combustion, and the quantity of raw incl such as coal, entering the system.

I aware that the invention may be embodied in other specific forms without dc- Erom the spirit or essential attributes thereof, and I therefore desire the embodiment to he considered in all respects as illustrative and not restrictive, reference being had to the appended claims to the foregoing d cription to indicate the scope of the invention.

1' claim:

1. A system of the class comin combination, a pu vcriscr, a furmace, means for withdrawing fuel "from said pulverizer and feeding the fuel so withdrawn to said furnace, means -for supplying raw fuel to saidpulverizer, and interdependent rueam for concomitantly varying the quantity of raw fuel supplied to said pulverizer and the quantity or fuel fed to said 2. A system of the class described comprising, in combination, a puiverizer, means for supplying raw fuel to said pulverizer,

a. furnace, means for withdrawing a variable quantity of pulverized fuel from said pulveriser and feeding the fuel so withdrawn to said furnace, and interdependent means for concomitantly regulating the quantity or raw fuel supplied to said pul: verizer and the quantity of furnace.

3. A s stem of the class described comprising, in combination, a pulverizer, a furnaoe, means pulverizer and feeding the fuel so withdrawn to said'furnace, means for supplying for withdrawing fuel from said its iuel fed to said i verifier means :Eos re uleting the usntity oi: revv fuel introduce into send ulveriser,

menus for supplying air to ssid urnece for combustion purposes, end means for var ing the quantity of sir supplied to seid slurnece and the quantity of new fuel supplied to said pulverizer eoncomizaeinil with e varieiion in the quantity of nine supplied w seid furnace.

5. A system of ihe class described comprising, in combination, a furnace, o pulverizer heving an air swept pulverizin chamber, means for withdrawing air an ulverized fuel from said pnlverizer and eeding the air and pulverized fuel so Withdrewn to seid furnace, means for supplying row fuel to seid pulverizer, means controlling the quantit of pulverized fuel with drawn from ssi pulverizer enol "fed to said furnace, and menus essocieting said lost two named means for concomitant operation of both. 5 6. ln s system of the class described the combination with e furnace, oi e pulveriuzer means for feeding fuel to said pulvesizaer means for Withdrawing pulverized fuel from said pulverizer end feeding the pulverized fuel so withdrewn to said furnace, end inierde ndent means for concomitantly verying t e quantity oi fuel fed to seid pulverizer and the quantity of pulverized fuel Withdrewn from said pulverizer, said lest named means including an adjustable device whereby said last named means may he odjusted to efiect a different relation hetwmn the rate of feed of fuel to the pulverizer and the rate of withdrawal of pulverized fuel from the pulverizer.

7. In as system of the class described, the combination with e furnace, of a pulverizer means for withdrawing ulverizer fuel from said pu-lverizer by fluid flotation and propulsion and feeding the pulverized fuel so withdrawn to said iurnace, saidmeens including a conduit leading from said gal verizer to said furnace and a, conduit branching from said conduit and returning to the pulverizer, valve means controll' the flow of elastic fluid through bothof sai conduits and the removal of pulverized fuel from ssiu ulverizer means controlling the supply of Kiel to sai pulverizer, and means associated with said valve means and said fuel supply mini-selling menus vurietion in snp nly ell materiel one pnlver'ises upon veneiien oi the weanling condition oi valve ivliereoi" signetuie, 

